mirror of
https://github.com/JayDDee/cpuminer-opt.git
synced 2025-09-17 23:44:27 +00:00
76 lines
1.6 KiB
C++
76 lines
1.6 KiB
C++
// Copyright (c) 2014 The Magi developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <iostream>
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#include <cfloat>
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#include <limits>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "magimath.h"
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#define EPS1 (std::numeric_limits<double>::epsilon())
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#define EPS2 3.0e-11
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static void gauleg(double x1, double x2, double x[], double w[], const int n)
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{
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int m,j,i;
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double z1, z, xm, xl, pp, p3, p2, p1;
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m=(n+1)/2;
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xm=0.5*(x2+x1);
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xl=0.5*(x2-x1);
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for (i=1;i<=m;i++) {
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z=cos(3.141592654*(i-0.25)/(n+0.5));
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do {
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p1=1.0;
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p2=0.0;
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for (j=1;j<=n;j++) {
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p3=p2;
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p2=p1;
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p1=((2.0*j-1.0)*z*p2-(j-1.0)*p3)/j;
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}
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pp=n*(z*p1-p2)/(z*z-1.0);
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z1=z;
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z=z1-p1/pp;
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} while (fabs(z-z1) > EPS2);
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x[i]=xm-xl*z;
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x[n+1-i]=xm+xl*z;
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w[i]=2.0*xl/((1.0-z*z)*pp*pp);
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w[n+1-i]=w[i];
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}
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}
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static double GaussianQuad_N(double func(const double), const double a2, const double b2, const int NptGQ)
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{
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double s=0.0;
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#ifdef _MSC_VER
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#define SW_DIVS 23
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double x[SW_DIVS+1], w[SW_DIVS+1];
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#else
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double x[NptGQ+1], w[NptGQ+1];
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#endif
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gauleg(a2, b2, x, w, NptGQ);
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for (int j=1; j<=NptGQ; j++) {
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s += w[j]*func(x[j]);
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}
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return s;
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}
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static double swit_(double wvnmb)
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{
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return pow( (5.55243*(exp_n(-0.3*wvnmb/15.762) - exp_n(-0.6*wvnmb/15.762)))*wvnmb, 0.5)
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/ 1034.66 * pow(sin(wvnmb/65.), 2.);
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}
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uint32_t sw_(int nnounce, int divs)
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{
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double wmax = ((sqrt((double)(nnounce))*(1.+EPS1))/450+100);
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return ((uint32_t)(GaussianQuad_N(swit_, 0., wmax, divs)*(1.+EPS1)*1.e6));
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}
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